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NCMA quaternary gradient material and preparation method thereof

A gradient material and element technology, applied in electrical components, active material electrodes, electrochemical generators, etc., can solve the problems of high production environment requirements and poor cycle performance of high-nickel materials, so as to facilitate industrial production, improve cycle performance, The effect of improving stability

Inactive Publication Date: 2020-09-22
NINGXIA SINOCHEM LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problems of poor cycle performance of high-nickel materials and high production environment requirements in the prior art

Method used

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  • NCMA quaternary gradient material and preparation method thereof
  • NCMA quaternary gradient material and preparation method thereof
  • NCMA quaternary gradient material and preparation method thereof

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preparation example Construction

[0075]The present invention also provides a preparation method of NCMA quaternary gradient material, preparing the above-mentioned NCMA quaternary gradient material, the method comprising: synthesizing NCMA containing Ni, Co, Mn, Al and a cladding layer containing element Mg The precursor for the quaternary gradient material is post-treated with the lithium salt and the precursor for the NCMA quaternary gradient material to prepare the NCMA quaternary gradient material.

[0076] In some embodiments, the method includes the steps of:

[0077] Dissolving nickel salt, cobalt salt, manganese salt and aluminum salt in water to prepare mixed solution A containing Ni, Co, Mn and Al, and mixed solution B containing Ni, Co, Mn and Al;

[0078] Prepare saturated magnesium salt solution C;

[0079] Making the mixed solution A, the mixed solution B and the magnesium salt solution C react in a reaction vessel to obtain a precursor for the NCMA quaternary gradient material;

[0080] The l...

Embodiment 1

[0102] (1) Nickel sulfate, cobalt sulfate, manganese sulfate, and aluminum sulfate are respectively prepared into a mixed solution A687.5L with a concentration of 2mol / L and Mixed solution B62.5L; prepare saturated magnesium salt solution C with 715g of analytically pure magnesium sulfate; prepare sodium hydroxide solution with a concentration of 8mol / L; prepare ammonia solution with a concentration of 6mol / L.

[0103] (2) Mix solution B with V by metering pump 2 = 0.5L / h speed into the container where the mixed solution A, control the speed of 80r / min and stir slowly to make it evenly mixed, AB mixed solution at a speed of V 1 =6L / h speed into the reactor. Adjust the flow rate of sodium hydroxide solution and ammonia solution, control the pH at about 11.5, the temperature is 50°C, the reaction kettle speed is 800r / min, and the reaction is carried out under the protection of nitrogen.

[0104] (3) When the first particle size in the reaction kettle reaches 7 μm, all the magn...

Embodiment 2

[0108](1) Nickel sulfate, cobalt sulfate, manganese sulfate, and aluminum sulfate are respectively prepared into a mixed solution A918L with a concentration of 1.5mol / L according to the molar ratio of 92:3:2:3 and 32:3:62:3 and mixed Solution B162L; prepare saturated magnesium salt solution C with 520g of analytically pure magnesium sulfate; prepare a sodium hydroxide solution with a concentration of 10mol / L; prepare an ammonia solution with a concentration of 8mol / L.

[0109] (2) Mix solution B with V by metering pump 2 Pour into the container where the mixed solution A is located at a speed of =0.9L / h, control the speed of 80r / min and stir slowly to make it evenly mixed, and the AB mixed solution is mixed at a speed of V 1 =6L / h speed into the reactor. Adjust the flow rate of sodium hydroxide solution and ammonia solution, control the pH at about 12.0, the temperature is 60°C, the reaction kettle speed is 900r / min, and the reaction is carried out under the protection of nit...

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Abstract

The invention discloses an NCMA quaternary gradient material and a preparation method thereof. The material sequentially comprises an inner core structure, a shell structure and a coating layer from inside to outside, wherein the coating layer contains an element Mg, a chemical general formula of the material except the coating layer is LiNixCoyMnzAlwO2, and values of x, y, z and w simultaneouslymeet the following conditions, 0.8 < / = x < / = 1, 0 < / = y < / = 0.1, 0 < / = z < / = 0.2, 0 < / = w < / = 0.1, and x + y + z + w = 1, a general chemical formula of the core structure is LiNiaCoyMnbAlwO2, a general chemical formula of the shell structure is LiNicCoyMndAlwO2, a is larger than or equal to 0.8 and smaller than or equal to 1, b is larger than or equal to 0 and smaller than or equal to 0.2, a is larger than x, b is smaller than z, and a + y + b + w = 1, c is larger than 0 and smaller than or equal to 0.6, d is larger than or equal to 0.3 and smaller than or equal to 0.9, c is smaller than x, dis larger than z, and c + y + d + w = 1. The material is advantaged in that cycle performance of the high-nickel material can be effectively improved while a high-nickel structure is guaranteed, the method is simple in manufacturing process and high in operability, industrial production of the high-nickel material is facilitated, and problems that in the prior art, cycle performance of the high-nickel material is poor, and the manufacturing environment requirement is high are solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to an NCMA quaternary gradient material (nickel-cobalt-manganese-aluminum quaternary gradient material) and a preparation method thereof. Background technique [0002] In today's society, under the dual pressure of environmental pollution and energy crisis, looking for clean green energy is the direction of the world's common efforts, and lithium-ion batteries occupy a very important place in clean energy, especially lithium-ion batteries as the power of automobiles It has developed rapidly in recent years, and it has also proposed a new development path for global energy and environmental issues. [0003] Since Sony began to use lithium-ion secondary batteries in the market in 1991, lithium-ion batteries have experienced a series of developments such as NCM111, NCM424, NCM523, and NCM622. At present, the materials used in lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张骁沈永龙刘平洪明子文荣刘青文汪伟秦小华
Owner NINGXIA SINOCHEM LITHIUM BATTERY MATERIAL CO LTD
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